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524 Maintenance
manufacturing processes are rather different. As a rule,
synthetic oil has better temperature stability and cold
properties but its friction properties sometimes result
in synchronisation faults. Synthetic oil can also have a
negative effect on sealing materials. It is therefore
important that approved synthetic oil is used.
A synthetic oil is not necessarily better than a mineral
oil. This is however a common misunderstanding and
extended oil replacement intervals are therefore
assumed. The service interval recommended by Volvo
apply irrespective of whether the oil is mineral-based
or synthetic.
Grade
A large number of grade designations are used.
Different oil types have different grade designations.
Viscosity
Viscosity is a very important property in an oil. It is a
measure of the runability of the oil, which effects the
thickness of the oil film and fuel consumption. The
ambient temperature in the area where the truck is
used, determines which viscosity is recommended.
There are two systems, called SAE viscosity grade
classifications, which divide oils into viscosity grades
(such as SAE 10W, SAE 80W-90 etc.) Engine oils and
transmission oils belong to two different systems. It is
therefore always important to know within which
system the viscosity grade is specified. For example,
engine oil with a viscosity grade SAE 40 has
approximately the same viscosity as transmission oil
with the viscosity grade SAE 90. However, in both
systems a higher number indicates a higher viscosity.
Service interval
When it has been decided which oil should be used
(i.e. the quality and viscosity are known), the
recommended service interval is fixed.
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